US Open 2017 round two photosUpdated 9:17 PM ET, Fri June 16, 2017 Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds. Photos: Images from Erin HillsDefending champion and world No. 1 Dustin Johnson was the biggest casualty of the halfway cut in the 117th US Open at Erin Hills. Hide Caption 1 of 10 Photos: Images from Erin HillsSecond and third-ranked Rory McIlroy and Jason Day also made early exits as the deep fescue rough took its toll on wayward shots.Hide Caption 2 of 10 Photos: Images from Erin HillsEngland's Paul Casey maintained his momentum from day one to card a 71 for seven under overall and in a four-way share of the lead. Hide Caption 3 of 10 Photos: Images from Erin HillsTommy Fleetwood was another Englishman in a share of the lead at seven under after two rounds Friday.Hide Caption 4 of 10 Photos: Images from Erin HillsAmerican Brooks Koepka climbed into a share of the lead with rounds of 67, 70.Hide Caption 5 of 10 Photos: Images from Erin HillsLeft-handed American Brian Harman completed the quartet in the lead, all searching for a first major title.Hide Caption 6 of 10 Photos: Images from Erin HillsMasters champion Sergio Garcia shot 71 to edge to three under and a tie for 18th, the highest-placed player with a major title to his name.Hide Caption 7 of 10 Photos: Images from Erin HillsJapan's Hideki Matsuyama was on target to break the major championship scoring record of 63 at seven under after 13 holes, but five pars coming home gave him a 65. Hide Caption 8 of 10 Photos: Images from Erin HillsMasters runner-up Justin Rose, the 2013 champion, was another big name heading home early from Wisconsin after ending two over.Hide Caption 9 of 10 Photos: Images from Erin HillsTwo-time Masters champion Bubba Watson seems to struggle in the other majors and the left-hander and his yellow ball missed the cut at Erin Hills with rounds of 75, 73 for four over.Hide Caption 10 of 10US Open 2017 round two photos.More from SportWhy horse racing in Ireland is a multi-billion-dollar industryHow one Dubai running club sparked a fitness crazeGiro d'Italia: Israel to host 2018 'Big Start' to Grand TourParis and Los Angeles confirmed as hosts of 2024 and 2028 Olympic GamesLuka Modric: 'Everyone wants to beat the best team in the world, Real Madrid'